Improvement in steam-boilers



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IMPROVEMENT IN STEAM-BOILERS.

Specification forming part of Letters Patent No. 152,064, dated June 16,1874; application filed April 6, 1874.

To 'all whom it may concern:

Be it known that I, ISAAC BARTON, of Williamsport, in the county ofLycoming and State of Pennsylvania, have invented a new and usefulImprovement in Steam-Boilers,

^ andl do vhereby declare that the following is a .full and `exactdescription of the same, reference being had to the accompanyingdrawings and to the letters of reference marked thereon.

The object I have in view is an improvement upon thevinvention describedin Letters Patent of the United States granted to me April 9, 1,872, forthe purpose of making the same more economical in use, and moreeffective in result, without materially increasing` its first cost; andmy invention therein consists in the novel construction and arrangementof the principal operative parts in order to produce the above results,as is more fully hereinafter explained.

In order to enable those skilled in the art to make and use my boiler, Iproceed to describe the same in connection with the drawing, in whichfFigure l is a vertical central section on line .fr Fig. 2, a centralvcross-section on line y y.

' Figure 3 is a vertical central section on line z z; and Fig. 4, a planfrom above, the dome being removed.

Similar letters denote like parts' in each figure.

Upon the base A of my boiler, having a proper ash-pit, grate, and doorsfor the removal of ashes, is mounted the fire-box B of considl erablyless diameter than the base, of a conical form tapering upward ofsufcient height to, give a fire-chamber, a, above the fuel, and madedouble throughout, 'leaving a space or chamber, b, between its inner andouter walls,

which space constitutes water-legs for the boiler or the outside shellof the nre-box or water-legs may be extended downward, and t-hus form anash-pit below the grate. This tirebox 'is provided with a suitableperforated door, c, around which is arranged a flangeplate, d, extendingout to, and connected with, the outer casing to the boiler, and havingupon either side openings d near the upper part ot' the same, which leadinto an air-jacket, G, extending from one side of the flange-plate d,around the outside of the waterlcgs, to the other side of theflange-plate. Suitable open ings d2 are made fromthis air-jacket intothe hre-chamber near its upper part. It follows, then, that cold airentering into the opening d1 will have circulation through saidair-jacket, and entering into the fire-chamber, just above the burningfuel, will assist in the combustion of the gases, and aid materially tothe draft. The upper part of the fire-chamber is terminated by adiaphragm-plate, a', which also extends over the top of the water-legs.From this plate a the outer plate alone of the fire-box is continuedupward to the lower plate e of the boiler proper E. This plate c extendslaterally, and is of greater diameter than the conical structure uponwhich it rests, which diameter is maintained throughout the entirelength of the boiler E. From the diaphragm a a nest of tubes, el,springs and terminates in the upper diaphragm c2, which forms the baseof the lower combustion chamber F of conical shape, tapering upward.This chamber F extends to the annular diaphragm e3, which connects thetop of this conical chamber with the shell of the boiler, and forms theupper diaphragm for the return-dues c4, which pass between it and thelower plate c of the boiler. This diaphragm c3 is also the base ot' theupper combustion chamber F', which is limited by the topmost plate orcap 7L of the boiler E. This plate or cap 7b is composed of two doors,h', which hinge in the center, and may be raised or taken out, asdesirable, in` order to allow free access to the interior of the boilerfor the purpose of cleaning and repairs. The plate or cap li may befurther provided with a damper, which allows the direct passage of thegases from the dre-chamber into the dome or smoke-box, in order toassist the draft. Afeed-waterheater-pipe, I, is introduced near the topof the boiler E, and runs spirally around the nest of tubes el, and4between them and the flues c4. This pipe I passes out of the boiler Enear its base, and on the same side on which it enters, and continuesdownward as a straight pipe to a low point in the waterlegs. This pipe,being exposed throughout its entire length to the action of the heatedgases, iujects the feed-water into the boiler at a high temperature, andeconomizes the heat to great advantage. The water in this boiler will becarried at about the height of the diaphragm c2, and the space abovethis point will be steamspace. It will be seen, therefore, that thepeculiar shape and position of the combustionchambers makes them veryuseful as superheaters to dry the steam. Pipes L', calledcirculating-pipes, are arranged vertically upon the outside of theboiler, and connect the waterspace above with the water-legs below, thusallowing a freer circulation of the water, and its greater exposure tothe heated gases. These pipes, continuing up as high as the steamspace,are further utilized as convenient positions for the various andnecessary gages and cocks. rlhe surface blow-oli' m is perforated at itslower extremity to accommodate itself to the varying height of water inthe boiler. The various impurities that gather at or near the surfacemay be gotten rid of by means of this pipe. The steam-pipes n, whichconnect the steam-space with thc steam-drum O, complete the immediateaccessories of the boiler E. The dome R, of conical shape taperingupward, surmounts the boiler E, and is so arranged that it is connectedwith it immovably, so that the outside shell or jacket S may be takendown without removing the smoke-stack. Its diameter at its base isgreater than the diameter of the boiler, and the same as that ofthekouter jacket or shell S, which extends from it to the base A of theboiler. The dome It is provided with a large door, i', which permitsentrance into the interior of the boiler, and allows the admission ofthe ifluebrushes, and such other instruments as are necessary forcleaning and repairs. The outer jacket S is made'of thin sheet-iron insections, or of brick, to allow of its being readily taken down, inorder to further facilitate access to diiferent parts of thc boiler. Inconnection with the dome R it forms an uptake for the products ofcombustion which have passed through the return-fines, and causes acomplete envelopment of the boiler in a jacket of hot gas, which itrestrains and guides up the chimney. In small boilers this jacket may becontinued downward, and form the shell of the ash-pit. The steam-drum 0is a cylindrical drum 4of s'uiiicient capacity to correspond with therest of the boiler. It is placed so as to be in close connection withthe steamspace, and, owing to its high position, takes up no extraamount of room. It aords a convenient receptacle for the steam, andobviates all danger of wet steam--a point dcserving great consideration.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. In combination with a boiler, E, a feedwater-heater pipe, I, passingspirali y between two clusters of tubes, c1 and c4, constructed andarranged substantially as described.

2. In combination with the boiler E, the lifting and removable cap h,composed of the doors h, constructed and arranged substantially asdescribed and shown.

3. A steam boiler wherein the furnace B, air-jacket C, spiral feed-waterpipe, I, tubes el, and doors h h are combined, constructed, and arrangedsubstantially as described and shown.

This specication signed and witnessed this 20th day of March, 1874.

'ISA M- B ARTO.

\\itnesses: y

JOHN En'rmmramts, F. SrRAYnR.

